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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 20, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Securities Act File Number 814-01299    
Entity Registrant Name Blackstone Secured Lending Fund    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 82-7020632    
Entity Address, Address Line One 345 Park Avenue    
Entity Address, Address Line Two 31st Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10154    
City Area Code (212)    
Local Phone Number 503-2100    
Title of 12(b) Security Common Shares of Beneficial Interest, $0.001 par value per share    
Trading Symbol BXSL    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 4,432
Entity Common Stock, Shares Outstanding   191,600,986  
Entity Central Index Key 0001736035    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false